結果

問題 No.1035 Color Box
ユーザー knshnbknshnb
提出日時 2020-04-24 21:52:12
言語 C++17
(gcc 13.2.0 + boost 1.83.0)
結果
AC  
実行時間 25 ms / 2,000 ms
コード長 3,639 bytes
コンパイル時間 2,527 ms
コンパイル使用メモリ 204,448 KB
実行使用メモリ 11,188 KB
最終ジャッジ日時 2024-04-23 03:12:05
合計ジャッジ時間 4,019 ms
ジャッジサーバーID
(参考情報)
judge5 / judge4
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 25 ms
11,000 KB
testcase_01 AC 16 ms
11,188 KB
testcase_02 AC 16 ms
11,024 KB
testcase_03 AC 17 ms
11,004 KB
testcase_04 AC 16 ms
11,012 KB
testcase_05 AC 16 ms
11,080 KB
testcase_06 AC 16 ms
11,084 KB
testcase_07 AC 16 ms
10,904 KB
testcase_08 AC 24 ms
11,120 KB
testcase_09 AC 19 ms
11,112 KB
testcase_10 AC 16 ms
11,028 KB
testcase_11 AC 16 ms
11,064 KB
testcase_12 AC 17 ms
10,896 KB
testcase_13 AC 21 ms
11,036 KB
testcase_14 AC 22 ms
11,084 KB
testcase_15 AC 23 ms
11,040 KB
testcase_16 AC 16 ms
11,084 KB
testcase_17 AC 17 ms
11,024 KB
testcase_18 AC 16 ms
11,124 KB
testcase_19 AC 23 ms
10,976 KB
testcase_20 AC 16 ms
11,036 KB
testcase_21 AC 16 ms
10,908 KB
testcase_22 AC 16 ms
11,188 KB
testcase_23 AC 16 ms
11,140 KB
testcase_24 AC 17 ms
10,972 KB
testcase_25 AC 16 ms
11,116 KB
testcase_26 AC 16 ms
11,184 KB
testcase_27 AC 16 ms
11,080 KB
testcase_28 AC 16 ms
11,020 KB
testcase_29 AC 17 ms
10,964 KB
testcase_30 AC 16 ms
10,904 KB
testcase_31 AC 16 ms
10,988 KB
testcase_32 AC 16 ms
11,012 KB
testcase_33 AC 15 ms
10,972 KB
testcase_34 AC 16 ms
10,912 KB
testcase_35 AC 16 ms
11,080 KB
testcase_36 AC 16 ms
11,056 KB
testcase_37 AC 16 ms
11,156 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

#include <bits/stdc++.h>  // clang-format off
using Int = long long;
#define REP_(i, a_, b_, a, b, ...) for (Int i = (a), lim##i = (b); i < lim##i; i++)
#define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
struct SetupIO { SetupIO() { std::cin.tie(nullptr), std::ios::sync_with_stdio(false), std::cout << std::fixed << std::setprecision(13); } } setup_io;
#ifndef _MY_DEBUG
#define dump(...)
#endif  // clang-format on

/**
 *    author:  knshnb
 *    created: Fri Apr 24 21:46:19 JST 2020
 **/

template <class T> T pow(T x, int n, const T UNION = 1) {
    T ret = UNION;
    while (n) {
        if (n & 1) ret *= x;
        x *= x;
        n >>= 1;
    }
    return ret;
}

/// @docs src/Math/ModInt.md
template <int Mod> struct ModInt {
    int x;
    static int runtime_mod;
    static std::unordered_map<int, int> to_inv;
    // テンプレート引数が負のときは実行時ModInt
    static int mod() { return Mod < 0 ? runtime_mod : Mod; }
    static void set_runtime_mod(int mod) {
        static_assert(Mod < 0, "template parameter Mod must be negative for runtime ModInt");
        runtime_mod = mod;
        to_inv.clear();
    }
    ModInt() : x(0) {}
    ModInt(long long x_) {
        if ((x = x_ % mod() + mod()) >= mod()) x -= mod();
    }

    ModInt& operator+=(ModInt rhs) {
        if ((x += rhs.x) >= mod()) x -= mod();
        return *this;
    }
    ModInt& operator*=(ModInt rhs) {
        x = (unsigned long long)x * rhs.x % mod();
        return *this;
    }
    ModInt& operator-=(ModInt rhs) {
        if ((x -= rhs.x) < 0) x += mod();
        return *this;
    }
    ModInt& operator/=(ModInt rhs) {
        x = (unsigned long long)x * rhs.inv().x % mod();
        return *this;
    }
    ModInt operator-() const { return -x < 0 ? mod() - x : -x; }
    ModInt operator+(ModInt rhs) const { return ModInt(*this) += rhs; }
    ModInt operator*(ModInt rhs) const { return ModInt(*this) *= rhs; }
    ModInt operator-(ModInt rhs) const { return ModInt(*this) -= rhs; }
    ModInt operator/(ModInt rhs) const { return ModInt(*this) /= rhs; }
    bool operator==(ModInt rhs) const { return x == rhs.x; }
    bool operator!=(ModInt rhs) const { return x != rhs.x; }
    ModInt inv() const { return to_inv.count(this->x) ? to_inv[this->x] : (to_inv[this->x] = pow(*this, mod() - 2).x); }

    friend std::ostream& operator<<(std::ostream& s, ModInt<Mod> a) {
        s << a.x;
        return s;
    }
    friend std::istream& operator>>(std::istream& s, ModInt<Mod>& a) {
        long long tmp;
        s >> tmp;
        a = ModInt<Mod>(tmp);
        return s;
    }
    friend std::string to_string(ModInt<Mod> a) { return std::to_string(a.x); }
};
template <int Mod> std::unordered_map<int, int> ModInt<Mod>::to_inv;
template <int Mod> int ModInt<Mod>::runtime_mod;

#ifndef CALL_FROM_TEST
using mint = ModInt<1000000007>;
#endif

template <class T> struct Combination {
    std::vector<T> fact, fact_inv;
    Combination(int n = 1000003) : fact(n + 1, 1), fact_inv(n + 1) {
        for (int i = 0; i < n; i++) fact[i + 1] = fact[i] * (i + 1);
        fact_inv[n] = (T)1 / fact[n];
        for (int i = n - 1; i >= 0; i--) fact_inv[i] = fact_inv[i + 1] * (i + 1);
        // for (int i = 0; i < n + 1; i++) assert(fact[i] * fact_inv[i] == 1);
    }
    T operator()(int n, int r) { return fact[n] * fact_inv[r] * fact_inv[n - r]; }
};

signed main() {
    Combination<mint> comb;
    Int n, m;
    std::cin >> n >> m;
    mint ans = 0;
    REP(i, m + 1) {
        int sign = (m - i) % 2 ? -1 : 1;
        ans += comb(m, i) * pow(mint(i), n) * sign;
    }
    std::cout << ans << std::endl;
}
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